/Engine/Source/Runtime/Slate/Public/Framework/MultiBox/SToolBarStackButtonBlock.h
Provides dynamic, icons, labels, & descriptions for this stack, caches on get
const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FUIIdentifierContext](API\Runtime\Slate\Framework\Commands\Contexts\FUIIdentifierContext) > GetStackIdentifier() const